Boiler-stoker.



J. E. BELL.

BOILER STOKER. APPLICATION FILED SEPT. 11, 1906.

Patented Aug. 24. 1909.

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WITNESSES m, QM s,

J. E. BELL.

BOILER STOKER.

APPLICATION FILED SEPT. 11, 1906. 932,369, Patented Aug. 24, 1909.

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WITNESSES F' .2 mvsn'ron f7 @(imsz v 1 I W x J. E. BELL.

BOILER STOKER.

APPLICATION FILED SEPT. 11, 1906.

Patented Aug. 24, 1909.

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WITNESSES Patented Aug. 24, 1909.

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AMMIDIHWW Is I I l I I J. E. BELL.

BOILER STOKER.

APPLICATION FILED SEPT. 11, 1906.

I I I I I I I I I I I I I I I I I I I I I I I I I I I 'I I I I WII'N asses UNITED STATES PATENT ()FFICE.

JOHN E. BELL, OF NEW YORK, N. 'Y., ASSIGNQB TO THE BABBOGK k WILUOX COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

BOILEB-STOKER.

Specification of Letters Patent. Patented Aug; 24;, 1909- Application filed September 11, 1906. Serial No. 334D89.

To all wh0m it may concern:

Be it known thatI, JOHN E. BELL, of New York, county and State of New York, have invented a new and Improved Boiler- Stoker, of-which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specification, in which I Figure l is a sectional side elevation, showingone form of a Stirling boiler prov ded with my improved stoke'r structure; Flg. 2 1s a dpartial tront elevation; fig. 3 is an enlarge detail view, showing the connection with the water back; Figs. 4 and 5 are deta l views hereinafter referred to; and Fig. 6 1s a view similar to Fig. 2, showing a modified form.

My invention relates to the class of boiler stokers wherein a chain grate is employed, andthe object of the invention is to provide an improved water back for such furnace structures.

My invention provides for reduci the hability of deposits in the water bac ,for clrculation therethrough, and to prevent over-heating or burning of the same,

In the drawing, 2, 3 and 4 represent upper transverse steamand water drums of a Stirling boiler, each connected by a bank of tubes 5, 6 and 7 with a lower transverse mud-drum S. I

9 and 10 represent the usual baffling to direct the gases rising from the furnace 11, so that these gases flow up and down in serial passes over the three banks to the outlet flue 1 2.

13 is a conventional illustrationof a chain rate, which extends back to. near the ridge wall 14. This bridge wall is transverse of the setting, nd in its front face I provide a water back 15, which consists, preferably, of a heavy steel tube, substan tially square or rectangular in cross section and extending through the side walls, as shown in Fig. 2. Over this box I preferably provide a series of ribbed cast plates 16, which act to protect the box from the intense heat of the furnace, air spaces being preferably provided between these plates and the masonry or brick work extending over them.

17 represent supports built into the ma sonr for the water box which overhangs the inner end of the chain grate.

Each end of the water box is connected heating or burning either or both directions.

outside of the setting by one or'more pipes or tubes 18 with the heads of the front u per drum 2. In 'Fig. 4 I show the preferre detail of the connection to the water box, the end of the box 15 having a hand-hole closure 19 with the pi e 18 leading through its u per side. I a so preferably rovide a-hol e on the under side in line wit 1 the pi e 18, provided with a fitting 20 for a hand va v'e 21, as shown in Fig. 2.

The end of the 11 per drum 2 is preferably provided with a itting 22 having a plug closure 2.3 in line with the tube 18.

The box is preferably inclined slightly from one end toward the other, so that the steam generated therein will rise toward the higher e and cause an up circulation through the tube 18 at such end. This will cause a re id circulation through the box, such circu ation being down through the tube 18 at the lower end and up through the tube 18 at the higher end, thus keeping the box filled with water and preventing over- The box ma how ever, be arranged without any inc ination, or its upper wa 1 may have an inclination in Any steam formed will start a circulation by entering the tube or tubes 18, and once started, the

avoid the precipitation of sediment in the water box, since the water is thus taken from a source where contains the least amount of scale or sediment-form ng mat ter, and thus in a four drum Stirling boiler I- preferably connect the b x to the front up er drum, as shown.

1 here the device is appliedto wide boilers, I may s mple two or more of the water boxes arranged em to end. Thus in Fig. 6 I show the box as consisting of two parts, 15" and 15 in line with each other, with their inner ends preferably closed by welding in heads or using any other desirable "closures. In such case of' a wide boiler I may also use further circulating tubes 24, which may connect the inner ends of these two boxes to the front upper steam and water drum at the center of its length, these entering tube holes which would otherwise be occupied by two tubes of the front row of the front bank of tubes. In this manner each box may have its own circulation independent of the other circulation, being u through the tubes 24 and down through t e cooler tubes 18.

The advantages of my invention result articularly from the connecting of the water back to the water space of asteam and water drumwhich is not the feed drum, and is preferably the front drum where a boiler of the transverse drum serial u and down pass type is used. It also results rom the use of external connecting tubes at op osite ends which rovide for a circulation t rough the water ack to car off steam and prevent burning. The water ack prevents abrasion of the bridge wall by the ashes which pass over the rear end of the stoker and reduces the amount of air admitted at this point, by giving a channel of uniform size for the passage of the ashes.

Added circulating tubes may be used in any form of the invention; the device may be used with other types of boilers, though it is especially adapted to boilers having a series of cross drums with a baffling to give the gases serial up and down passes over the anks, and many other variations may be made without departing from my invention.

I claim:

1. In a tubular boiler furnace having uper'and lower water drums, an upwardly projecting bridge wall having above it an outlet for flame and gases, a transversely extending water-back in said bridge wall, and-direct connections between opposite ends of. the.

said water back and an upper drum arranged to produce a down circulation in one connection and an up circulation in the other connection; substantially as described.

2. In a boiler furnace, an upwardly projecting bridge wall, having above it an outlet port forflame and gases from the furnace, and a hollow water back member for said bridge well, said water back having its ends connected with an u per water space of the boiler, and being cibsed except for such connections, whereby there is a circulation downward through one of said connections, thence through the water back and u wardly throu h the other connection, su stantially as (Iescribed.

3. In a boiler, an upper transverse steam and water drum, a lower mud'drum, a bridge wall extending parallel to the said drums and abutting aga nst the lower mud drum at its rear side, and a water back having'c'o'nnec tions at its ends with said drum arranged to cause a down circulation through one of said connections and an up circulation through the other connection; substantially as described.

4; In a boiler furnace, an upwardly projecting bridge wall having a water back thereon with an outlet port for flame and gases above it, said water back having an endwise inclination, and water tubes at each end connecting said ends to an u per water 'space ofthe boiler; substantialy as described.

5. In a boiler furnace, a water back comprising a box, connections for circulating water therethrough, and iron plates extending over the box and arranged to protect it from the heat of the furnace substantially as described.

6. In a boiler furnace, an upwardlyproj ecting bridge wall, over which the flame and gases pass, a water-back in the front face of said wall, metal plates extending over the box to protect it from the heat of the furnace, and'circulating connections between the said back and a steam and, water space of the boiler substantially as described.

7. In a water tube boiler a plurality of upper transverse steam and water drums, a bridge wall which extends arallel to the said drums, a water back mem er for said bridge wall and water pipes forming a direct connection between the water back member and one of the u per drums, said drum being remote from tiie drum to which the feed water supply pipe leads, and the member being ing connections at its ends with said drum ar- 100 ranged to cause a down circulation through one of said connections, and an up circulation through the other connection, substantially as described.

In testimony whereof, I have hereunto set 105 my hand.

JOHN E. BELL. WVitnesses:

ESTHER V. BUNELL, G. K. WANNEMACHER. 

